Lens mount



NOV. 8, 1938. Kl NCHTERLElN 2,136,149

LENS MOUNT Filed June 4, 193'? Patented Nov. 8, 1938 PATENT OFFICE LENS MOUNT Karl Nchterlein, Dresden,`Germany, assignor to Ihagee Kamerawerk Steenbergen Co., Dresden, Germany Application June 4, 1937, Serial No. 146,484

3 Claims.

My present invention relates to an improved lens mount of the quick detachable type, for photographic cameras, and While I have illustrated the lens mount in connection with a miniature camera, it will be understood that this lens mount ls equally applicable for use with other types of cameras.

A complete equipment for a camera usually includes various lenses or objectives, which, when 1g provided with my improved mounts, may be interchanged for use with the camera to meet different requirements and conditions in the art of picture taking.

By the simple construction and arrangement of parts embodied in my invention a lens mount may with facility be detached and separated from the lens-attaching part of the camera, and another lens mount substituted therefor with equal facility, to form a rigid and ilxed element of the camera.

In carrying out my invention I employ co-acting members rigid with the camera and the lens mount respectively, which are quickly and frictionally interconnected or joined by a simple d twist of the wrist, and then the lens mount is positively locked or latched against relative rotary movement, to prevent loosening of the mount or accidental detachment of the mount from the Camera.

My invention consists in certain novel combinations and arrangements of parts as will hereinafter be more fully set forth and claimed.

In the accompanying drawing I have illustrated one complete example of the physical embodiment of my invention, wherein the parts are combined and arranged in accord with one mode I have devised for the practical-application of the principles of my invention, but it will be understood that various changes and alterations may be 40 made in the exemplifying structures, within the scope of my claims, without departing from the principles of the invention.

Figure 1 is a. perspective view looking at the front oi a camera that is equipped with a lens mount of my invention, the usual cap being shown in place for protection I the lens.

Figure 2 is a side view of the lens mount, 'showing also, in section, the attaching ring removed from the camera.

Figure 3 is a front face view of the attaching ring, separated from the camera.

Figure 4 is a transverse sectional view of the attaching ring.

Fig-ure 5 is a face view or rear elevation of the lens mount separated from the camera, and

(ci. ss-s'l) Figure 6 is an enlarged detail fragmentary view of part of the attaching ring showing the spring pressed locking lever, detent, or hooked latch which retains the mount against rotary movement with relation to the attaching ring of the camera.

In order that the general arrangement and relation of parts may readily be understood I have shown in Figure 1 a camera of the miniature type, and designated the casing as C, an unfolding hood as H, a winding lever L and its rotary driving head D, together with the timing dial or ring T.

0n the front central portion of the body or casing of the camera, an exterior flat, open-center plate I is fastened, as by screws, with its circular opening alined with the optical axis o! the camera. and an attaching ring 2 i'lts neatly into the plate-opening, with the front edge of the ring projecting slightly in front of the attaching plate. This attaching ring is fashioned with an exterior annular attaching flange 3 that is provided with holes 4 for the attaching screws 6, and by means oi the screws the ring is permanently fixed on the attaching plate, and becomes a part of the camera body or casing.

As best seen in Figure 3, the attaching ring is fashioned with a series of inner circumferentially arranged integral locking anges B, disposed at suitable intervals within the inner periphery of the ring. The number oi' these spaced flanges may be varied. and they form arcuate, inner ribs projecting inwardly and radially of the ring, the arcuate length of the ribs or flanges. and the spaces between these flanges forming an interrupted, inner annular flange on the ring.

On the outer face of the flange 3 oi' the attaching ring I mount a. spring-actuated detent, lever or iocking latch l, which is pivoted at B, on the flange 3, and provided with a spring 9 (dotted lines) coiled about the pivot oi the latch. The spring tends to swing the hooked end Il) of the latch toward the ring and provides a resilient means for retaining the hooked end in locking position.

The other end of the spring latch is provided with a knob Il that is readily accessible to the photographer. and it will be apparent that thumb pressure or finger pressure against the knob toward the attaching ring will swing the hooked end of the latch outwardly, or away from the attaching ring, against the tension oi' the spring, and when pressure is released, the spring 9 will return the latch to its initial position.

Forcoactionwiththearcuateilaneesl.the mainbarrei Il oithelensmount.whiehisre ducedindiameteratitsend Il.isiasbioncd with complementary series oi' arcuate nanges il and intervening spaces.

The arcuate, exterior ilanges Il on the perimeter oi' the reduced end il oi the barrel Il. which 'are flush with the inner tace oi the reducedend.areoftherequiredlengthtopermit them to pass through the complementary spaces between the arcuate anges 6 oi the attaching ring. Asbestseeninl'igures2and4thearcuateilangeslareinsetiromtheedgeorback face of the attaching ring. so that, when the inner end of the barrel is inserted Vin the outer end of the attaching ring the iianges Il pass through the openings between the arcuate flanges 0. and beyond these ilanges i. Then, by a twist of the wrist, the lens mount is tin'ned tobringthe danses Mbackoi'andintotrlctional contact with the arcuate flanges I. and at the same time the annular shoulder Ilot the barrel i2 frictionally engages the outer faces oi' lthe anges t of the attaching ring. Ihese parts are iltted closely so that considerable force is necessary to irictionaliy engage the adjoining faces of the arcuatecams or ribs, and the friction temporarily holds the mount in place.

The hooked end Il of the locking latch. however. is employed to positively retain the mount in the attaching ring, and prevent turning oi the mount or accidental detachment thereof.

For co-action with the hooked end oi the locking latch I provide a pin It rigid with the exterior knurled ring I1 and projecting therefrom parallel with the longitudinal axis of the mount, and this pin is located in such position that when the mount has been properly turned or twisted into engagement with the attaching ring, the pin will be in position to be engaged by the hooked end oi the locking latch. A small stop screw Il is threaded in the perimeter oi' the cylindrical, reduced end of the barrel, and located in position to stop the turning movementoi'thebarrelasitisbeingtwistedinto place, and this stop screw insures that the turning oi. the mount will stop at a point where the hooked end will snap over the pin I6 as in Figure 6, and thereby retain the mount from rotary movement in either direction.

For removal or separation oi the mount from the camera. nger pressure is ilrst applied to the knob il to disengage the hooked end of the lochng latch from the pin Il, and then a re verse or anti-clockwise twist of the mount releases the arcuate ilanges Il from the anges Bandthelensmountmaythenbexmiledor withdrawn, longitudinally. from the attaching ring.

aisance Withintholensmountiscarriedtheirisdiaphragm il that is adjusted by turning the knurled ring 2l; the knurled ring 2l is turned toiocusthelenswithinthemount iordis tance.andacap22lsshowninl"lgure1ior protecting the lens within the mount.

Having thus fully described my: invention. whatlclaimasnewanddesiretosecureby Letters Patent is:-

1. The combination with a camera having a ilxed attaching ring. circumierentially spaced interior arcuate ilanges on the ring. a springpressed locking latch pivotally mounted on the ring and having a notch adjacent one end thereoi', the other end oi said latch comprising an operating lever and being spaced from said ring. oi' a lens mount including a barrel having complementary arcuate interior anges for fric- 'tional engagement with the ilrst mentioned i'ianges.aplnonsaidbarreladaptedtobeen gaged by said notch upon rotation of said barrel to locking position, and means limiting the movement oi said barrel whereby the rotation oi said barrel is stopped when said pin is alined with said notch.

2. 'lhe combination with a camera having a fixed attaching ring, circumierentlally spaced interior, arcuate iianges on the ring, a springpressed locking latch pivotally mounted on the ring and havinga notch adjacent one end thereof, the other end of said latch comprising an operating lever and being spaced from said ring. of a lens mount including a barrel having complcmentary arcuate interior ilanges for frictional engagement with said first mentioned ilanges. a pin on said barrel adapted for engagement with said notch upon rotation of said barrel to locking position, and a stop pin on the barrel adapted to engage one of said ring danges to limit the rotation ot the barrel at a point where the ilrst said pin is alined with said notch.

3. The combination with a camera having a ilxed attaching ring, circumierentially spaced interior, arcuate anges on the ring, an angular spring-pressed locking latch pivotally mounted on the ring and having a notch adjacent one end thereof, the other end oi said latch comprising an operating` lever and being normally spaced from said ring, of a lens mount including a barrel having complementary arcuate iianges, for trictional engagement with said drst mentioned-ilanges, a pin on said barrel adapted for engagement with said notch upon rotation of said barrel to locking position, and a stop pin on the barrel adapted to engage one oi said ring anges to limit the rotation of the barrel at a poixwhere the rst said pin is alined with said no KARL NiicH'rEaim. n 

